Starter kit 1x 70gr 49% high absorbence, with 1 single holder If you live in high humidity year-round, here's the solution to keep guitars and other wood instruments in the moisture safe zone. Tested in a lab at rainforest-like conditions! Absorbs 3x more moisture than Boveda 49% RH. Using Boveda High-Absorbency in an instrument case: Protects wood instruments from warping in year-round extreme humidity level of 50+% (Lower humidity? Shop Boveda 49% RH for wood instruments here. ) Staves off mildew build-up Automatically maintains constant RH between 45% and 55%—;the safe zone for wooden instruments Prevents humidity fluctuation from going in and out of air-conditioned venues, playing outdoors or traveling by air